Perhaps you should try some spelling variations:
"nijhoff book title 20" » "nijhoff boston title 20", "nijhoff op title 20", "nijhoff book titles 20", "nijhoff book table 20", "nijhoff work title 20", "nijhoff book title 2", "nijhoff book title 10", "nijhoff book title 21"
"nijhoff ebook title 2009" » "nijhoff book titles 2009", "nijhoff ebook titles 2009", "nijhoff ebook table 2009", "nijhoff ework title 2009", "nijhoff ebook title 2012", "nijhoff ebook title 29", "nijhoff ebook title 209", "nijhoff ebook title 1009", "nijhoff ebook title 2109"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff book title 20") OR ("nijhoff ebook title 2009")).
• Removing quotes may allow a broader search: (( nijhoff book title 20 ) or ( nijhoff ebook title 2009 )).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff book title 20") or ("nijhoff ebook title 2009"))*.